SIST EN ISO 17640:2011
(Main)Non-destructive testing of welds - Ultrasonic testing - Techniques, testing levels, and assessment (ISO 17640:2010)
Non-destructive testing of welds - Ultrasonic testing - Techniques, testing levels, and assessment (ISO 17640:2010)
This European Standard specifies techniques for the manual ultrasonic testing of fusion welded joints in metallic materials equal to and above 8 mm thick which exhibit low ultrasonic attenua¬tion (especially that due to scatter) at object temperatures from 0°C to 60°C. It is primarily intended for use on full penetration welded joints where both the welded and parent material are ferritic.
Where material dependent ultrasonic values are specified in this stan¬dard they are based on steels having an ultraso¬nic sound velocity of 5920 ± 50 m/s for longitudinal waves, and 3255 ± 30 m/s for transverse waves.
The standard specifies four testing levels, each corresponding to a different probability of detection of imperfections. Guidance on the selection of testing levels A, B and C is given in annex A.
The requirements of testing level D, which is intended for special applications, shall be in accordance with the general requirements of this standard and may only be used when defined by specification. This includes tests of metals other than ferritic steel, tests on partial penetration welds, tests with automated equipment, tests at object temperatures outside the range.
This standard may be used for the assessment of indications, for acceptance purposes, by either of the following techniques:
a) Evaluation based primarily on length and echo ampli¬tu¬de of the signal indication;
b) Evaluation based on characterization and si¬zing of the indication by probe movement techniques.
The techniques used shall be specified.
Zerstörungsfreie Prüfung von Schweißverbindungen - Ultraschallprüfung - Techniken, Prüfklassen und Bewertung (ISO 17640:2010)
Dieses Dokument legt Verfahren zur manuellen Ultraschallprüfung von Schmelzschweißverbindungen in
metallischen Werkstoffen mit Dicken gleich und größer als 8 mm fest, die bei Temperaturen des
Prüfgegenstands von 0 °C bis 60 °C eine geringe Ultraschallschwächung zeigen (verursacht vor allem durch
Streuung). Sie gilt bevorzugt für Schweißverbindungen mit voll angeschlossenem Querschnitt, bei denen
sowohl Grundmaterial als auch Schweißgut ferritisch sind.
Alle werkstoffabhängigen Größen der Ultraschallprüfung in dieser Norm beziehen sich auf Stahl, in dem
Schall die folgenden Schallgeschwindigkeiten hat: (5 920 ± 50) m/s für Longitudinalwellen und
(3 255 ± 30) m/s für Transversalwellen.
In diesem Dokument sind vier Prüfklassen festgelegt, die unterschiedlichen Wahrscheinlichkeiten des
Nachweises von Unregelmäßigkeiten entsprechen. Hilfestellung zur Wahl der Prüfklassen A, B und C wird im
Anhang A angegeben.
Die Anforderungen der Prüfklasse D, die für besondere Anwendungen vorgesehen ist, müssen mit den
allgemeinen Anforderungen dieser Norm übereinstimmen. Die Prüfklasse D darf nur dann angewendet
werden, wenn dies in einer entsprechenden Spezifikation gefordert wird. Dies umfasst auch Prüfungen an
anderen Metallen als ferritischer Stahl, Prüfungen an Schweißnähten mit unvollständiger Durchschweißung,
Prüfungen mit automatisierten Anlagen und Prüfungen bei Temperaturen des Prüfgegenstands außerhalb des
Bereiches von 0 °C bis 60 °C.
Diese Norm darf auf Zulässigkeitsbetrachtungen für die Bewertung von Anzeigen mittels einer der folgenden
Methoden angewendet werden:
a) die Auswertung basiert vorzugsweise auf der Länge und der Echohöhe der Anzeige;
b) die Auswertung basiert auf der Charakterisierung und Größenabschätzung von Anzeigen mit Hilfe von
Abtasttechniken.
Die angewendeten Methoden müssen spezifiziert werden.
Contrôle non destructif des assemblages soudés - Contrôle par ultrasons - Techniques, niveaux d'essai et évaluation (ISO 17640:2010)
L'ISO 17640:2010 spécifie des techniques de contrôle manuel par ultrasons des assemblages en matériaux métalliques soudés par fusion, d'épaisseur égale ou supérieure à 8 mm, présentant une atténuation relativement faible des ultrasons (en particulier celle due à la diffusion) à des températures d'objet comprises entre 0 °C et 60 °C. Elle vise particulièrement les assemblages soudés à pleine pénétration dont le métal de base et la soudure sont ferritiques.
Lorsque les valeurs des caractéristiques ultrasonores dépendantes des matériaux sont précisées dans l'ISO 17640:2010, elles concernent des aciers dans lesquels la vitesse des ondes ultrasonores est égale à (5 920 ± 50) m/s pour les ondes longitudinales et (3 255 ± 30) m/s pour les ondes transversales.
L'ISO 17640:2010 spécifie quatre niveaux de contrôle, chacun correspondant à une probabilité différente de détection des défauts. Un guide du choix des niveaux de contrôle A, B et C est donné dans l'Annexe A.
L'ISO 17640:2010 spécifie que les exigences relatives au niveau de contrôle D, qui est prévu pour des applications spéciales, sont conformes aux exigences générales. Le niveau de contrôle D ne peut qu'être utilisé lorsque défini par une spécification. Cela inclut les contrôles de métaux autres que les aciers ferritiques, les contrôles sur des soudures à pénétration partielle, les contrôles avec des équipements automatisés, et les contrôles à des températures d'objet situées hors de la plage 0 °C à 60 °C.
L'ISO 17640:2010 peut être utilisée pour l'évaluation des indications, aux fins de réception, par l'une des techniques suivantes: a) évaluation fondée principalement sur la longueur et l'amplitude d'écho de l'indication du signal; b) évaluation fondée sur la caractérisation et le dimensionnement de l'indication par des techniques de déplacement du palpeur.
Les techniques utilisées doivent être spécifiées.
Neporušitveno preskušanje zvarnih spojev - Ultrazvočno preskušanje - Tehnike, stopnje sprejemlivosti in kriteriji ocenjevanja (ISO 17640:2010)
Ta evropski standard določa tehnike za ročno ultrazvočno preskušanje zvarnih spojev pri talilnem varjenju na kovinskih materialih z debelino 8 mm ali več z nizkim ultrazvočnim slabljenjem (predvsem slabljenjem zaradi razpršitve) pri temperaturah predmeta med 0 °C in 60 °C. Namenjen je predvsem uporabi pri zvarnih spojih s popolno penetracijo, pri katerih sta zvarni in matični material feritna. Kjer so v tem standardu določene od materiala odvisne ultrazvočne vrednosti, temeljijo na jeklih, ki imajo ultrazvočno hitrost zvoka 5920 ± 50 m/s za vzdolžne valove in 3255 ± 30 m/s za prečne valove.
Standard določa štiri ravni preskušanja in vsaka od njih ustreza drugačni verjetnosti odkrivanja nepravilnosti. V dodatku A je podano vodilo o izboru ravni preskušanja A, B in C.
Zahteve za raven preskušanja D, ki je namenjena posebni uporabi, so v skladu s splošnimi zahtevami tega standarda in se lahko uporabljajo le, kadar jih določa specifikacija. To vključuje preskuse kovin, ki niso feritno jeklo, preskuse na zvarih z delno penetracijo, preskuse z avtomatsko opremo in preskuse pri temperaturah predmeta zunaj razpona.
Ta standard se lahko uporabi za ocenjevanje prikazov, za namene sprejemljivosti, z eno od naslednjih tehnik:
a) Vrednotenje, ki temelji predvsem na dolžini in amplitudi odmeva signalnega prikaza,
b) Vrednotenje, ki temelji na karakterizaciji in določanju velikosti prikaza s tehnikami premikanja sond.
Določene so tudi uporabljene tehnike.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 17640:2011
01-december-2011
1DGRPHãþD
SIST EN 1714:1999
SIST EN 1714:1999/A1:2003
SIST EN 1714:1999/A2:2004
1HSRUXãLWYHQRSUHVNXãDQMH]YDUQLKVSRMHY8OWUD]YRþQRSUHVNXãDQMH7HKQLNH
VWRSQMHVSUHMHPOLYRVWLLQNULWHULMLRFHQMHYDQMD ,62
Non-destructive testing of welds - Ultrasonic testing - Techniques, testing levels, and
assessment (ISO 17640:2010)
Zerstörungsfreie Prüfung von Schweißverbindungen - Ultraschallprüfung - Techniken,
Prüfklassen und Bewertung (ISO 17640:2010)
Contrôle non destructif des assemblages soudés - Contrôle par ultrasons - Techniques,
niveaux d'essai et évaluation (ISO 17640:2010)
Ta slovenski standard je istoveten z: EN ISO 17640:2010
ICS:
25.160.40 Varjeni spoji in vari Welded joints
SIST EN ISO 17640:2011 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 17640:2011
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SIST EN ISO 17640:2011
EUROPEAN STANDARD
EN ISO 17640
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 25.160.40 Supersedes EN 1714:1997
English Version
Non-destructive testing of welds - Ultrasonic testing -
Techniques, testing levels, and assessment (ISO 17640:2010)
Contrôle non destructif des assemblages soudés - Contrôle Zerstörungsfreie Prüfung von Schweißverbindungen -
par ultrasons - Techniques, niveaux d'essai et évaluation Ultraschallprüfung - Techniken, Zulässigkeitsgrenzen und
(ISO 17640:2010) Bewertungskriterien (ISO 17640:2010)
This European Standard was approved by CEN on 27 November 2010.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17640:2010: E
worldwide for CEN national Members.
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SIST EN ISO 17640:2011
EN ISO 17640:2010 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 17640:2011
EN ISO 17640:2010 (E)
Foreword
This document (EN ISO 17640:2010) has been prepared by Technical Committee CEN/TC 121 “Welding”, the
secretariat of which is held by DIN, in collaboration with Technical Committee ISO/TC 44 "Welding and allied
processes".
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2011, and conflicting national standards shall be withdrawn at
the latest by June 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1714:1997.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
3
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SIST EN ISO 17640:2011
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SIST EN ISO 17640:2011
INTERNATIONAL ISO
STANDARD 17640
Second edition
2010-12-15
Non-destructive testing of welds —
Ultrasonic testing — Techniques, testing
levels, and assessment
Contrôle non destructif des assemblages soudés — Contrôle par
ultrasons — Techniques, niveaux d'essai et évaluation
Reference number
ISO 17640:2010(E)
©
ISO 2010
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SIST EN ISO 17640:2011
ISO 17640:2010(E)
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ii © ISO 2010 – All rights reserved
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SIST EN ISO 17640:2011
ISO 17640:2010(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Symbols and definitions.2
4 Principle .2
5 Information required prior to testing.3
5.1 Items to be specified.3
5.2 Specific information required before testing .3
5.3 Written test procedure .4
6 Requirements for personnel and equipment.4
6.1 Personnel qualifications.4
6.2 Equipment .4
6.3 Probe parameters.4
7 Testing volume .5
8 Preparation of scanning surfaces .5
9 Parent metal testing .6
10 Range and sensitivity setting.7
10.1 General .7
10.2 Reference for sensitivity setting.7
10.3 Evaluation levels .8
10.4 Transfer correction.8
10.5 Signal to noise ratio .8
11 Testing levels.9
12 Testing techniques.9
12.1 General .9
12.2 Manual scan path .9
12.3 Testing for imperfections perpendicular to the testing surface.9
12.4 Location of indications .9
12.5 Evaluation of indications.10
13 Test report.11
Annex A (normative) Testing levels for various types of welded joints .13
© ISO 2010 – All rights reserved iii
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SIST EN ISO 17640:2011
ISO 17640:2010(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 17640 was prepared by the European Committee for Standardization (CEN) Technical Committee
TC 121, Welding, Subcommittee SC 5, Testing of welds, in collaboration with ISO Technical Committee TC 44,
Welding and allied processes, Subcommittee SC 5, Testing and inspection of welds, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 17640:2005), which has been technically
revised.
Requests for official interpretations of any aspect of this International Standard should be directed to the
Secretariat of ISO/TC 44/SC 5 via your national standards body. A complete listing of these bodies can be
found at www.iso.org.
iv © ISO 2010 – All rights reserved
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SIST EN ISO 17640:2011
INTERNATIONAL STANDARD ISO 17640:2010(E)
Non-destructive testing of welds — Ultrasonic testing —
Techniques, testing levels, and assessment
1 Scope
This International Standard specifies techniques for the manual ultrasonic testing of fusion-welded joints in
metallic materials of thickness greater than or equal to 8 mm which exhibit low ultrasonic attenuation
(especially that due to scatter) at object temperatures from 0 °C to 60 °C. It is primarily intended for use on full
penetration welded joints where both the welded and parent material are ferritic.
Where material-dependent ultrasonic values are specified in this International Standard, they are based on
steels having an ultrasonic sound velocity of (5 920 ± 50) m/s for longitudinal waves and (3 255 ± 30) m/s for
transverse waves.
This International Standard specifies four testing levels, each corresponding to a different probability of
detection of imperfections. Guidance on the selection of testing levels A, B, and C is given in Annex A.
This International Standard specifies that the requirements of testing level D, which is intended for special
applications, be in accordance with general requirements. Testing level D can only be used when defined by
specification. This includes tests of metals other than ferritic steel, tests on partial penetration welds, tests with
automated equipment, and tests at object temperatures outside the range 0 °C to 60 °C.
This International Standard can be used for the assessment of indications, for acceptance purposes, by either
of the following techniques:
a) evaluation based primarily on length and echo amplitude of the signal indication;
b) evaluation based on characterization and sizing of the indication by probe movement techniques.
The techniques used shall be specified.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 5817, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding
excluded) — Quality levels for imperfections
ISO 9712, Non-destructive testing — Qualification and certification of personnel
ISO 11666:2010, Non-destructive testing of welds — Ultrasonic testing of welded joints — Acceptance levels
ISO 23279, Non-destructive testing of welds — Ultrasonic testing — Characterization of indications in welds
ISO 17635, Non-destructive testing of welds — General rules for metallic materials
EN 473, Non-destructive testing — Qualification and certification of NDT personnel — General principles
© ISO 2010 – All rights reserved 1
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SIST EN ISO 17640:2011
ISO 17640:2010(E)
EN 583-1, Non-destructive testing — Ultrasonic examination — Part 1: General principles
EN 583-2, Non-destructive testing — Ultrasonic examination — Part 2: Sensitivity and range setting
EN 583-4, Non-destructive testing — Ultrasonic examination — Part 4: Examination for discontinuities
perpendicular to the surface
EN 1330-4, Non-destructive testing — Terminology — Part 4: Terms used in ultrasonic testing
EN 12668 (all parts), Non-destructive testing — Characterization and verification of ultrasonic examination
equipment
3 Symbols and definitions
3.1 For the purposes of this International Standard, the definitions given in EN 1330-4 and ISO 17635 apply.
3.2 For symbols, their definitions, and units, see Table 1.
Indications shall be considered to be either longitudinal or transverse, depending on the direction of their
major dimension with respect to the weld axis, x, in accordance with Figure 2.
Table 1 — Symbols, their definitions, and units
Symbol Definition Unit
D diameter of the disk-shaped reflector mm
DSR
h extension of the indication in depth direction mm
l length of the indication mm
l projected length of the indication in the x-direction mm
x
l projected length of the indication in the y-direction mm
y
p full skip distance mm
t thickness of parent material (thinnest part) mm
x position of the indication in the longitudinal direction mm
y position of the indication in the transverse direction mm
z position of the indication in depth mm
4 Principle
The purpose of this International Standard is to describe general techniques of ultrasonic weld testing, using
standard criteria, for the most commonly used welded joints at object temperatures in the range 0 °C to 60 °C.
The specific requirements of this International Standard cover the equipment, preparation, performance of the
testing, and reporting. The parameters specified, in particular those for the probes, are compatible with the
requirements of ISO 11666 and ISO 23279.
2 © ISO 2010 – All rights reserved
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SIST EN ISO 17640:2011
ISO 17640:2010(E)
5 Information required prior to testing
5.1 Items to be specified
These include:
a) method for setting the reference level;
b) method to be used for evaluation of indications;
c) acceptance levels;
d) testing level;
e) manufacturing and operation stage(s) at which the testing is to be carried out;
f) qualification of personnel;
g) extent of the testing for transverse indications;
h) requirements for additional tandem testing (see EN 583-4);
i) parent metal testing prior to and/or after welding;
j) whether or not a written testing procedure is required;
k) requirements for written testing procedures.
5.2 Specific information required before testing
Before any testing of a welded joint can begin, the operator shall have access to the following essential
information:
a) written testing procedure, if required (see 5.3);
b) type(s) of parent material and product form (i.e. cast, forged, rolled);
c) manufacturing or operation stage at which testing is to be made, including heat treatment, if any;
d) time and extent of any post-weld heat treatment;
e) joint preparation and dimensions;
f) requirements for surface conditions;
g) welding procedure or relevant information on the welding process;
h) reporting requirements;
i) acceptance levels;
j) extent of testing, including requirements for transverse indications, if relevant;
k) testing level;
l) personnel qualification level;
m) procedures for corrective actions when unacceptable indications are revealed.
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SIST EN ISO 17640:2011
ISO 17640:2010(E)
5.3 Written test procedure
The definitions and requirements in this International Standard normally satisfy the need for a written test
procedure.
Where this is not the case, or where the techniques described in this International Standard are not applicable
to the weld joint to be examined, additional written test procedures shall be used, if required by specification.
6 Requirements for personnel and equipment
6.1 Personnel qualifications
Personnel performing testing in accordance with this International Standard shall be qualified to an
appropriate level in ultrasonic testing in accordance with ISO 9712 or EN 473 or equivalent in the relevant
industrial sector.
In addition to a general knowledge of ultrasonic weld inspection, personnel shall also be familiar with testing
problems specifically associated with the type of weld joints to be examined.
6.2 Equipment
Any equipment used for testing in conjunction with this International Standard shall comply with the
requirements of EN 12668 (all parts).
6.3 Probe parameters
6.3.1 Test frequency
The frequency shall be within the range 2 MHz to 5 MHz, and shall be selected to comply with the specified
acceptance levels.
For the initial testing, the frequency shall be as low as possible, within the above range, when the evaluation is
carried out according to acceptance levels based on length and amplitude, e.g. ISO 11666. Higher
frequencies may be used to improve range resolution if this is necessary when using standards for
acceptance levels based on characterization of indications, e.g. ISO 23279.
Frequencies of approximately 1 MHz may be used for testing at long sound paths where the material shows
above average attenuation.
6.3.2 Angles of incidence
When testing is carried out with transverse waves and techniques that require the ultrasonic beam to be
reflected from an opposite surface, care shall be taken to ensure that the angle between the beam and the
normal to the opposite reflecting surface is between 35° and 70°. Where more than one probe angle is used,
at least one of the angle probes used shall conform with this requirement. One of the probe angles used shall
ensure that the weld fusion faces are examined at, or as near as possible to, normal incidence. When the use
of two or more probe angles is specified, the difference between the nominal beam angles shall be 10° or
greater.
Angles of incidence at the probe and opposite reflecting surface, when curved, may be determined by drawing
a sectional view of the weld or in accordance with the techniques given in EN 583-2. Where angles of
incidence cannot be determined as specified by this International Standard, the testing report shall contain a
comprehensive description of the scans used and the extent of any incomplete coverage caused, together
with an explanation of the difficulties encountered.
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SIST EN ISO 17640:2011
ISO 17640:2010(E)
6.3.3 Element size
The element size shall be chosen according to the ultrasonic path to be used and the frequency.
The smaller the element, the smaller the length and width of the near field, and the larger the beam spread in
the far field at a given frequency.
Small probes having 6 mm to 12 mm diameter elements (or rectangular elements of equivalent area) are
therefore most useful when working at short beam path ranges. For longer ranges, i.e. greater than 100 mm
for single normal beam probes and greater than 200 mm for angle beam probes, an element size of 12 mm to
24 mm is more suitable.
6.3.4 Adaptation of probes to curved scanning surfaces
The gap, g, between test surface and bottom of the probe shoe shall not be greater than 0,5 mm.
For cylindrical or spherical surfaces, this requirement can be checked with Equation (1):
2
a
g= (1)
D
where
a is the dimension, in millimetres, of the probe shoe in the direction of testing;
D is the diameter, in millimetres, of the component.
If a value for g larger than 0,5 mm results from the equation, the probe shoe shall be adapted to the surface
and the sensitivity and range shall be set accordingly.
6.3.5 Coupling media
The coupling media shall be in accordance with EN 583-1. The coupling medium used for range and
sensitivity setting and for the test shall be the same.
7 Testing volume
The testing volume (see Figure 1) is defined as the zone which includes weld and parent material for at least
10 mm on each side of the weld, or the width of the heat-affected zone, whichever is greater.
In all cases, scanning shall cover the whole testing volume. If individual sections of this volume cannot be
covered in at least one scanning direction, or if the angles of incidence with the opposite surface do not meet
the requirements of 6.3.2, alternative or supplementary ultrasonic techniques or other non-destructive
techniques shall be agreed upon. This may, in some cases, require removal of the weld reinforcement.
Supplementary techniques may require testing using dual element angle beam probes, creeping wave probes,
further ultrasonic techniques or any other suitable method, e.g. liquid penetrant, magnetic particle,
radiographic testing. In selecting alternative or supplementary techniques, due consideration should be given
to the type of weld and probable orientation of any imperfections to be detected.
8 Preparation of scanning surfaces
Scanning surfaces shall be wide enough to permit the testing volume (see Figure 1) to be fully covered.
Alternatively, the width of the scanning surfaces may be smaller if equivalent coverage of the testing volume
can be achieved by scanning from both the upper and the lower surface of the joint.
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SIST EN ISO 17640:2011
ISO 17640:2010(E)
Scanning surfaces shall be even and free from foreign matter likely to interfere with probe coupling (e.g. rust,
loose scale, weld spatter, notches, grooves). Waviness of the test surface shall not result in a gap between
the probe and test surfaces greater than 0,5 mm. These requirements shall be ensured by dressing if
necessary. Local variations in surface contour, e.g. along the edge of the weld, which result in a gap beneath
the probe of up to 1 mm, can only be permitted if at least one additional probe angle is employed from the
affected side at the weld. This additional scanning is necessary to compensate for the reduced weld coverage
that will occur with a gap of this dimension.
Scanning surfaces and surfaces from which the sound beam is reflected shall allow undisturbed coupling and
reflection.
9 Parent metal testing
The parent metal, in the scanning zone area (see Figure 1), shall be examined with straight beam probes prior
to or after welding, unless it can be demonstrated (e.g. previous testing during the fabrication process) that the
angle probe testing of the weld is not influenced by the presence of the imperfections or high attenuation.
Where imperfections are found, their influence on the proposed angle beam testing shall be assessed and, if
necessary, the techniques adjusted correspondingly. When satisfactory coverage by ultrasonic testing is
seriously affected, other inspection techniques (e.g. radiography) shall be considered.
Dimensions in millimetres
Key
1 position 1
2 position 2
3 position 3
a width of testing volume
b scanning zone width
Figure 1 — Example of testing volume to be covered when scanning for longitudinal indications
6 © ISO 2010 – All rights reserved
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SIST EN ISO 17640:2011
ISO 17640:2010(E)
10 Range and sensitivity setting
10.1 General
Setting of range and sensitivity shall be carried out prior to each testing in accordance with this International
Standard and EN 583-2, taking the influence of temperature into account. The temperature difference during
range and sensitivity setting and during the test shall be within ±15 °C.
Checks to confirm these settings shall be performed at least every 4 h and on completion of the testing.
Checks shall also be carried out whenever a system parameter is changed or changes in the equivalent
settings are suspected.
If deviations are found during these checks, the corrections given in Table 2 shall be carried out.
Table 2 — Sensitivity and range corrections
Sensitivity
1 Deviations u 4 dB Setting shall be corrected before the testing is continued.
2 Setting shall be corrected and all testing carried out with
Reduction of the sensitivity > 4 dB
the equipment over the previous period shall be
repeated.
3 Increase in sensitivity > 4 dB Setting shall be corrected and all recorded indications
shall be re-examined.
Range
1 Deviations u 2 % of the range Setting shall be corrected before testing is continued.
2 Deviations > 2 % of the range Setting shall be corrected and testing carried out with the
equipment over the previous period shall be repeated.
10.2 Reference for sensitivity setting
One of the following techniques for setting the reference shall be used.
a) Technique 1: the reference is a distance-amplitude curve (DAC) for side-drilled holes of diameter 3 mm.
b) Technique 2: the references for transverse and longitudinal waves using the distance gain size (DGS)
system based on the diameter of the disk-shaped reflector (DSR) are given in Tables 3 and 4 respectively.
c) Techn
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